Skill disparity with Abyssal Tech 1 and 2 crystals

Is it my imagination or do the Abyssal Tech 1 and Tech II crystals both require Abyssal Ore Processing IV to use ? Other crystals require level III for Tech 1 and level IV for Tech 2.

I would have thought that the Abyssal Tech 1 crystals would need Abyssal Ore Processing level III, in line with the other crystals. Or am I missing something ?